Rates of Reaction Coursework
Aim:
To find out how different concentrations of sodium thiosulphate (Na S2 O3) affects the speed of its reaction with Hydrochloric acid (HCL).
Introduction
When Sodium Thiosulphate and Hydrochloric acid react they produce a cloudy precipitate. Both of the chemicals are clear solutions and they react together to form a yellow precipitate of sulphur, the equation for this reaction is:
Na2 S2 O3 + HCL, H2 O + NaCL + SO2 + S
Sodium Thiosulphate + Hydrochloric acid, Water + Sodium chloride + Sulphur dioxide
Because the solution turns cloudy we observe the rate of reaction by putting a black cross under the flask and watch and time the reaction until the cross disappears. Factors that can affect this experiment are temperature, concentration and time. I will change the concentration of the Sodium Thiosulphate because this is easily varied.
Preliminary work
For my preliminary work I tried doing the experiment with 40cm3 of......
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